IP Network Multipathing in Shared-IP Zones

IP network multipathing (IPMP) provides physical interface failure detection
and transparent network access failover for a system with multiple interfaces
on the same IP link. IPMP also provides load spreading of packets for systems
with multiple interfaces.

All network configuration is done in the global zone. You can configure
IPMP in the global zone, then extend the functionality to non-global zones.
The functionality is extended by placing the zone's address in an IPMP group
when you configure the zone. Then, if one of the interfaces in the global
zone fails, the non-global zone addresses will migrate to another network
interface card. A shared-IP
zone can have multiple IP addresses, it can be part of multiple IPMP groups,
and a given IPMP group can be used by multiple shared-IP zones.

In a given non-global zone, only the interfaces associated with the
zone are visible through the ifconfig command.